Vue parent component promotes methods in child components

I am a sub component
  

 

  export default {
    name: "child",
    methods: {
     parentHandleclick(e) {
        console.log(e)
      }
  }

Click me to promote the subcomponent method
    
  

 

  import Child from './child';
  export default {
    name: "parent",
    components: {
      child: Child
    },
    methods: {
      clickParent() {
        this.$ refs.mychild.parentHandleclick (the "parent component calls the child component method" < span style = "color:" ff0000; ">);
      }
    }
  }
</span>